Congratulations on entering your final year! I would suggest leveraging your network, especially your professors. Perhaps no one in your immediate network is in the profession but they may have a connection to a professional in the field. I am not in the field but is there possibly a group for it? For example, in the accounting profession we have the Massachusetts Society for CPAs which hosts events for CPAs in the area to connect and network. Something like that would be a great opportunity for you to connect with a mentor and perhaps learn of internship opportunities. Additionally, does your school have some sort of career center or alumni relations? These can be great assets in determining internship opportunities. If your school does not possess such resources do they partner with a school that does? I would try to explore those avenues the most because they should help place you in addition to assisting you in obtaining your degree.
Best of luck.